Replace benchfella with benchee

Author: Shubham Gupta

README.md

@@ -39,14 +39,11 @@ The package can be installed as:
 
 ## Benchmarks
 
-- We use benchfella for the benchmark tests. Run it using the following
+- We use benchee for the benchmark tests. Run it using the following
     ```
-    MIX_ENV=test mix bench
-    MIX_ENV=test mix bench
-    # Generate graphs of the above runs
-    MIX_ENV=test mix bench.graph
+    mix run test/xirr_comparison_bench.exs
     ```
-- The report is available [here](http://htmlpreview.github.io/?https://github.com/scripbox/ex-xirr/blob/master/bench/graphs/index.html)
+- The reports are available in the ```benchmarks``` folder.
 
 ## Credits
 

bench/.gitignore

@@ -0,0 +1,12 @@
+Font license info
+
+
+## Font Awesome
+
+   Copyright (C) 2016 by Dave Gandy
+
+   Author:    Dave Gandy
+   License:   SIL ()
+   Homepage:  http://fortawesome.github.com/Font-Awesome/
+
+